<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <title>Title</title>
    <style type="text/css">
        #message{
            border: 1px solid #000;
            color: dodgerblue;
        }
    </style>
</head>
<body>
<h1>TestWebSocket index</h1>
<textarea rows="10" cols="50" id="text" type="text"></textarea>
<div>
    <button onclick="send()">发送</button>
    <button onclick="closeWebSocket()">关闭</button>
</div>
<div id="message"></div>
</body>
<script type="text/javascript">
    var websocket = null;
    //判断当前浏览器是否支持WebSocket
    if ('WebSocket' in window) {
        //连接WebSocket节点
        websocket = new WebSocket("ws://localhost:8088/connectWebSocket/001");
    } else {
        alert('Not support websocket')
    }
    //连接发生错误的回调方法
    websocket.onerror = function () {
        setMessageInnerHTML("error");
    };
    //连接成功建立的回调方法
    websocket.onopen = function (event) {
        setMessageInnerHTML("open");
    };
    //接收到消息的回调方法
    websocket.onmessage = function (event) {
        setMessageInnerHTML(event.data);
    };
    //连接关闭的回调方法
    websocket.onclose = function () {
        setMessageInnerHTML("close");
    };
    //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function () {
        websocket.close();
    };

    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML) {
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //关闭连接
    function closeWebSocket() {
        websocket.close();
    }

    //发送消息
    function send() {
        var message = document.getElementById('text').value;
        var msg = {message: message, userId: '001', to: '002'};
        websocket.send(JSON.stringify(msg));
    }
</script>
</html>